But so close I think. It's already in 6.14 kernel.

just fyi to you or anyone else. Proton already uses esync & fsync to get about the same result so you're not going to see much of a difference.

The kernel addition as well as wine needing to add it is for regular wine. I think a lot of stuff already just uses proton instead. We're lucky we have access to it, steam is still closed source.